and explain the microscopic origin of the BH entropy [1]}. Unfortunately, despite significant progress [2]}, only a small fraction of the 3-charge micro-states are explicitly known [3]} and even for them probing the geometry with massless/ massive particles or waves turns out to be rather laborious due to the lack of separability/integrability with flat space-time asymptoticsWith AdS boundary conditions, the \((1,0,n)\)  system looks separable. [4]}, [5]}.
